8.
观察下列各式:\( \dfrac {1}{ \sqrt {2}+1}= \dfrac {1×( \sqrt {2}-1)}{( \sqrt {2}+1)( \sqrt {2}-1)}= \dfrac { \sqrt {2}-1}{2-1}= \sqrt {2}-1\),同理:\( \dfrac {1}{ \sqrt {4}+ \sqrt {3}}=…= \sqrt {4}- \sqrt {3}\),\(…\)从计算结果中找出规律,并利用这一规律计算:\(( \dfrac {1}{ \sqrt {2}+1}+ \dfrac {1}{ \sqrt {3}+ \sqrt {2}}+ \dfrac {1}{ \sqrt {4}+ \sqrt {3}}+…+ \dfrac {1}{ \sqrt {2018}+ \sqrt {2017}})( \sqrt {208}+1)\)